Design and Simulation of Two Stroke Engines

Design and Simulation of Two-Stroke Engines
Cthr 0.15, DR 0.30, 7200 rpm
AIR-TO-FUEL RATIO
Fig. 7.17 Simulation of effect ofAFR on part-throttle HC emissions.
50Q Cthr 0.15, DR 0.30, 7200 rpm 4Q0
11 12 13 14 15 16 17
AIR-TO-FUEL RATIO
-300
I
CO
CM"
O
200 j§
Fig. 7.18 Simulation of effect ofAFR on part-throttle CO and O2 emissions.
measured data in Fig. 7.7: the rise in bsHC after the stoichiometric point is visible in both
diagrams, but that from the simulation shows greater variability, in part visually due to the
scale chosen for that graph. The total hydrocarbons level off after the stoichiometric point
and this effect is also seen from the simulated data. In Fig. 7.18, the carbon monoxide emissions
calculated are identical to the profile of the measured values in Fig. 7.8. The calculated
oxygen content in the exhaust is similar in profile to that measured in Fig. 7.8.
482
100